AP BIOLOGY

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EVOLUTION

THE ORIGIN OF LIFE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
“Instead of originating from complex molecules like RNA, DNA, life might have begun with small and simple molecules interacting with each other in cycles of reactions. These reactions might have been change a simple capsule to cell membranes and over timemore complex molecules or cells.". This statement belongs to:
A
Theory of biochemical evolution
B
Community clay
C
Simple beginnings
D
RNA world
Explanation: 

Detailed explanation-1: -The Miller-Urey experiment In 1953 American chemists Harold C. Urey and Stanley Miller tested the Oparin-Haldane theory and successfully produced organic molecules from some of the inorganic components thought to have been present on prebiotic Earth.

Detailed explanation-2: -Under these conditions, they suggested that: Simple inorganic molecules could have reacted (with energy from lightning or the sun) to form building blocks like amino acids and nucleotides, which could have accumulated in the oceans, making a “primordial soup.” 3.

Detailed explanation-3: -Prokaryotes were the earliest life forms, simple creatures that fed on carbon compounds that were accumulating in Earth’s early oceans. Slowly, other organisms evolved that used the Sun’s energy, along with compounds such as sulfides, to generate their own energy.

Detailed explanation-4: -Chemosynthetic Theory of Origin of Life As per A.I. Oparin, in the distant past, life originated on the earth through some series of combinations of chemical substances, which all happened in water. About 5 billion years ago, the Earth originated from hot gases and vapours of many chemicals.

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